CN113691746A - LED background and green screen shooting synthetic method and system - Google Patents

LED background and green screen shooting synthetic method and system Download PDF

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Publication number
CN113691746A
CN113691746A CN202110984543.1A CN202110984543A CN113691746A CN 113691746 A CN113691746 A CN 113691746A CN 202110984543 A CN202110984543 A CN 202110984543A CN 113691746 A CN113691746 A CN 113691746A
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frame
film
curtain
picture
pictures
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CN113691746B (en
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李龙威
曹正之
黄康宁
杨俊超
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Surreal Film Production Shanghai Co ltd
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Surreal Film Production Shanghai Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/08—Trick photography
    • G03B15/10—Trick photography using back-projection, i.e. blending artificial background with real foreground
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Studio Circuits (AREA)
  • Studio Devices (AREA)

Abstract

The application relates to a method and a system for synthesizing LED background and green screen shooting, which belong to the technical field of movie and television work processing and comprise the following steps: building an LED large screen; setting a screen shooting frame rate, and adjusting the frame rate of the LED large screen to be x times of the screen shooting frame rate; controlling the shooting frame rate of the camera to be the same as the frame rate of the LED large screen; shooting a film with a curtain background and an LED background alternately appearing; the method has the advantages of simultaneously having the curtain and the LED background and avoiding the defects of the curtain and the LED background.

Description

LED background and green screen shooting synthetic method and system
Technical Field
The invention relates to the technical field of movie and television work processing, in particular to a method and a system for synthesizing LED background and green screen shooting.
Background
Background synthesis technology is required to be used in the shooting process of a plurality of current film and television works, the background used by the background synthesis technology is the LED background which is also generated besides the traditional curtain, and the number of frames of the LED background is higher than that of the traditional curtain, so that the color mixing processing is easier to perform. However, the screen is finer than the LED background, and the LED background is prone to moire, which affects the image effect after the synthesis. Backdrop generally comprises a blue screen and a green screen, with asia commonly using blue screens and europe commonly using green screens.
The above prior art solutions have the following drawbacks: the background synthesis technology of the curtain and the LED background has advantages and disadvantages, and a method which has the advantages of both and can avoid the disadvantages is needed at present.
Disclosure of Invention
On the one hand, in order to have the advantages of both the curtain and the LED background and avoid the disadvantages, the present application provides a method for synthesizing the LED background and the green curtain shot.
The LED background and green screen shooting synthesis method provided by the application adopts the following technical scheme:
an LED background and green screen shooting synthesis method comprises the following steps:
building an LED large screen;
setting a screen shooting frame rate, and adjusting the frame rate of the LED large screen to be x times of the screen shooting frame rate;
controlling the shooting frame rate of the camera to be the same as the frame rate of the LED large screen;
shooting a film with a curtain background and an LED background alternately appearing;
and processing the shot film background.
Through adopting above-mentioned scheme, can have curtain and LED background both's advantage simultaneously, bring a lot of facilities for post processing, the alignment picture that can relax. The post-processing progress is accelerated, the color mixing is also helped, for example, the anti-green processing is carried out, and the correct picture color tone and the background light effect can be easily obtained through the LED background picture. And the defects of LED background shooting, such as Moire patterns, insufficient picture fineness and the like, can be solved through the traditional flow of the green screen.
Preferably, the film with the background of the photographic curtain and the background of the LEDs alternately comprises:
dividing the LED large-screen playing content according to the current frame rate of the LED large-screen, wherein each frame of playing content is used as a single-frame picture;
dividing the number of the single frame pictures of the played content by x to obtain the number of curtain replacing frames;
replacing the single-frame picture equal to the curtain replacing frame number in the single-frame pictures of the played content with the curtain picture, wherein the single-frame pictures of the adjacent frames of the curtain picture are the original pictures;
and the LED large screen plays the processed picture and shoots a film.
Through adopting above-mentioned scheme, the big screen of LED is handled the broadcast content earlier before the broadcast for the picture itself that broadcasts out alternates the curtain background of pure look, can directly carry out post processing after the camera is shot.
Preferably, the film with the background of the photographic curtain and the background of the LEDs alternately comprises:
after shooting a film, performing early-stage processing on the film, dividing the film according to the current frame rate, and taking each frame of film as a single-frame picture;
dividing the number of single-frame pictures of the film by x to obtain the number of curtain replacement frames;
and replacing the single frame picture equal to the curtain replacing frame number in the single frame pictures of the film with the curtain picture, wherein the single frame pictures of the adjacent frames of the curtain picture are the original pictures.
By adopting the scheme, the film can be directly inserted with the pure-color curtain background in the film after being shot, and can be played after being post-processed. The processed curtain background of the film under the condition of high frame number can not influence the playing effect, and the post processing is easier.
Preferably, the number of original pictures between adjacent curtain pictures is the number of gap pictures, the number of the gap pictures is calculated, and the number of the gap pictures is x-1;
recording the sequence of the curtain picture and the original picture in the replaced playing picture to form a picture frame number distribution map;
after the film is shot, each frame of the film is corrected according to the frame number distribution diagram of the frame, and the curtain background and the LED background are respectively processed according to the frame number distribution diagram of the frame.
By adopting the scheme, the curtain picture is uniformly distributed in the played picture, and the picture frame number distribution map can help the worker to check whether the automatically processed image has a problem or not and can also help the worker to process the curtain and the LED background.
Preferably, the number of original pictures between adjacent curtain pictures is the number of gap pictures, the number of the gap pictures is calculated, and the number of the gap pictures is x-1;
recording the sequence of the screen picture and the original picture in the replaced film picture to form a film frame number distribution map;
selecting all curtain pictures in the film according to the film frame number distribution map, and processing the curtain pictures after confirming that the curtain pictures are normal;
and processing the original picture in the film according to the film frame number distribution map.
Through adopting above-mentioned scheme, the curtain picture evenly distributed in the film, it is littleer to the broadcast effect influence, and film frame number distribution diagram can help the staff to proofread whether the film after the automatic processing goes wrong, can also help the staff to handle curtain and LED background.
Preferably, before replacing the single frame picture equal to the number of the curtain replacing frames in the single frame pictures of the playing contents with the curtain picture, the LED large-screen playing contents are checked, the set frame number picture with the monotonous picture color in the playing contents is selected, and the initial frame inserted by the curtain picture is selected according to the selected playing picture distribution.
By adopting the scheme, the position which is most suitable for inserting the start frame of the curtain picture is found out by automatically detecting the picture color, so that the playing content can be as natural as possible.
Preferably, before replacing a single frame picture equal to the number of the curtain replacement frames in a single frame picture of the film with the curtain picture, the content of the film is checked, a set frame number picture with the monotonous picture color in the content of the film is selected, and an initial frame inserted by the curtain picture is selected according to the selected play picture distribution.
By adopting the scheme, the position which is most suitable for inserting the starting frame of the screen picture is found out by automatically detecting the picture color, so that the played film is smoother, and the film watching experience is improved.
On the other hand, in order to have the advantages of both the curtain and the LED background and to be able to avoid the disadvantages, the present application provides an LED background and green curtain shot composition system.
The application provides a synthetic system is shot with green curtain to LED background adopts following technical scheme:
an LED background and green screen shooting synthesis system comprises an LED large screen, shooting equipment and a control system, wherein the control system comprises a frame rate control module, a shooting synchronization module, a film shooting module and a post-processing module;
the frame rate control module receives an input curtain frame rate, and adjusts the playing frame rate of the LED large screen to be x times of the curtain frame rate;
the shooting synchronization module calls the play frame rate of the frame rate control module to synchronize the shooting frame rate and the play frame rate of the shooting equipment;
the film shooting module calls the playing frequency of the shooting synchronization module and shoots the film with the curtain background and the LED background alternately appearing according to the playing frequency;
and the post-processing module performs post-processing on the received shot film.
Through adopting above-mentioned scheme, can have curtain and LED background both's advantage simultaneously, bring a lot of facilities for post processing, the alignment picture that can relax. The post-processing progress is accelerated, the color mixing is also helped, for example, the anti-green processing is carried out, and the correct picture color tone and the background light effect can be easily obtained through the LED background picture. And the defects of LED background shooting, such as Moire patterns, insufficient picture fineness and the like, can be solved through the traditional flow of the green screen.
Preferably, the film shooting module includes a picture dividing unit and a content replacing unit;
the picture dividing unit calls the playing content of the LED large screen and the playing frequency of the frame rate control module, and the picture dividing module divides the playing content into single-frame pictures equal to the number of the playing frequency;
the content replacement unit divides the number of the single-frame pictures by x to obtain a curtain replacement frame number, the content replacement module replaces the single-frame pictures equal to the curtain replacement frame number in the played content with the curtain pictures, the single-frame pictures of the adjacent frames of the curtain pictures are all original pictures, the content replacement module transmits the processed played content to the LED large screen for playing, and the shooting equipment transmits the film to the post-processing module after shooting the film.
Through adopting above-mentioned scheme, the big screen of LED is handled the broadcast content earlier before the broadcast for the picture itself that broadcasts out alternates the curtain background of pure look, can directly carry out post processing after the camera is shot.
Preferably, the film shooting module includes a film dividing unit and a film replacing unit;
the film dividing unit calls films shot by the shooting equipment and the playing frame rate of the frame rate control module, and divides the films into single-frame pictures equal to the number of the playing frequencies;
the film replacing unit divides the number of the single-frame pictures by x to obtain a curtain replacing frame number, the film replacing unit replaces the single-frame pictures equal to the curtain replacing frame number in the film with the curtain pictures, the single-frame pictures of the adjacent frames of the curtain pictures are all original pictures, and the film replacing module transmits the processed playing content to the post-processing module.
By adopting the scheme, the film can be directly inserted with the pure-color curtain background in the film after being shot, and can be played after being post-processed. The processed curtain background of the film under the condition of high frame number can not influence the playing effect, and the post processing is easier.
In conclusion, the invention has the following beneficial effects:
1. can have both advantages of curtain and LED background simultaneously, bring a lot of facilities for post processing, alignment picture that can relax accelerates the post processing progress, obtains correct picture tone and background light effect very easily through LED background picture.
2. Many of the disadvantages of LED background photography can be solved by the traditional flow of green curtains.
Drawings
FIG. 1 is an overall system block diagram of an embodiment of an LED background and green screen shooting composition system according to an embodiment of the present application;
FIG. 2 is an overall block diagram of an embodiment of a system for combining LED background and green screen shots according to an embodiment of the present application;
fig. 3 is a block diagram of a film capture module according to an embodiment of the present application, which is an embodiment of a system for combining LED background and green screen capture;
fig. 4 is a block diagram of a film capture module according to an embodiment of the present application, which is an embodiment of a system for combining LED background and green screen capture.
In the figure, 1, an LED large screen; 2. a photographing device; 3. a control system; 31. a frame rate control module; 32. a shooting synchronization module; 33. a film shooting module; 34. a post-processing module; 341. a picture dividing unit; 342. a content replacement unit; 343. a graph establishing unit; 344. an automatic frame selection unit; 345. a movie division unit; 346. a movie replacement unit; 347. a graphic creation unit; 348. and automatically inserting the frame unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses a method for synthesizing LED background and green screen shooting, which comprises the following specific steps:
and (3) building the LED large screen 1, and transmitting the LED background to be played to the LED large screen 1 according to the film requirement.
The curtain shooting frame rate is set (the curtain shooting frame rate is set to be 24 in the embodiment), and the frame rate of the LED large screen 1 is adjusted to be x times of the curtain shooting frame rate (x is 2 in the embodiment).
And controlling the shooting frame rate of the camera to be the same as the frame rate of the LED large screen 1, and realizing the shooting frame rate of the camera and the LED large screen 1 through GENLOCK.
Film with the curtain background and the LED background alternately appearing is shot. Dividing the playing content of the LED large screen 1 according to the current frame rate of the LED large screen 1, wherein each frame of the playing content is used as a single frame picture. The number of the single frame pictures of the playing content is divided by 2 to obtain a curtain replacement frame number, and the curtain replacement frame number is 24. And replacing the single frame picture with the curtain picture, wherein the single frame picture is equal to the curtain replacing frame number in the single frame pictures of the played content, and the single frame pictures of the adjacent frames of the curtain picture are the original pictures. The original picture number between adjacent curtain pictures is the number of gap pictures, the number of gap pictures is calculated, and the number of gap pictures is x-1, namely 24. Checking the playing content of the LED large screen 1, selecting a set frame number picture with the monotonous picture color in the playing content, and selecting an initial frame for inserting a screen picture according to the selected playing picture distribution. The insertion format uses a format in which adjacent frames are uncorrelated.
Recording the sequence of the curtain picture and the original picture in the replaced playing picture to form a picture frame number distribution map. After the film is shot, each frame of the film is corrected according to the frame number distribution diagram of the frame, and the curtain background and the LED background are respectively processed according to the frame number distribution diagram of the frame. The screen picture is evenly distributed in the playing picture, and the picture frame number distribution map can help a worker to check whether the automatically processed image has a problem or not, and can also help the worker to process the screen and the LED background.
And (4) playing the processed picture on the LED large screen 1 to shoot a film.
And processing the shot film background, and playing the film after the background processing is finished.
The implementation principle of the LED background and green screen shooting synthesis method in the embodiment of the application is as follows: can have both advantages of curtain and LED background simultaneously, bring a lot of facilities for post processing, alignment picture that can relax. The post-processing progress is accelerated, the color mixing is also helped, for example, the anti-green processing is carried out, and the correct picture color tone and the background light effect can be easily obtained through the LED background picture. And the defects of LED background shooting, such as Moire patterns, insufficient picture fineness and the like, can be solved through the traditional flow of the green screen.
The second embodiment of the application discloses a method for synthesizing an LED background and a green screen shot, which is different from the first embodiment in that when a film with a curtain background and an LED background alternately appears is shot. After the films are shot, the films are subjected to early-stage processing, the films are divided according to the current frame rate, and each frame of film is used as a single-frame picture. The number of single frame pictures of the film is divided by x to obtain the number of curtain replacement frames. And replacing the single-frame picture which is equal to the curtain replacing frame number in the single-frame pictures of the film with the curtain picture. The single frame pictures of the adjacent frames of the curtain picture are all original pictures. The original picture number between adjacent curtain pictures is the number of gap pictures, the number of gap pictures is calculated, and the number of gap pictures is x-1, namely 24. Checking the playing content of the LED large screen 1, selecting a set frame number picture with the monotonous picture color in the playing content, and selecting an initial frame for inserting a screen picture according to the selected playing picture distribution. The insertion format uses a format in which adjacent frames are uncorrelated.
Recording the sequence of the curtain picture and the original picture in the replaced film picture to form a film frame number distribution map. And selecting all curtain pictures in the film according to the film frame number distribution map, and processing the curtain pictures after confirming that the curtain pictures are normal. And processing the original picture in the film according to the film frame number distribution map. The curtain picture evenly distributed in the film, it is littleer to the broadcast effect influence, and film frame number distribution map can help the staff to proofread whether the film after the automatic processing goes wrong, can also help the staff to handle curtain and LED background.
The embodiment of the application discloses an LED background and green screen shooting combination system, as shown in fig. 1 and fig. 2, which comprises an LED large screen 1, a shooting device 2 and a control system 3. The control system 3 includes a frame rate control module 31, a shooting synchronization module 32, a movie shooting module 33, and a post-processing module 34.
As shown in fig. 2, the frame rate control module 31 receives an input screen frame rate, and the frame rate control module 31 adjusts the play frame rate of the LED large screen 1 to be x times of the screen frame rate.
As shown in fig. 2, the shooting synchronization module 32 calls the play frame rate of the frame rate control module 31 to synchronize the shooting frame rate of the shooting device 2 with the play frame rate.
As shown in fig. 2 and 3, the movie shooting module 33 calls the play frequency of the shooting synchronization module 32 to shoot a movie in which the backdrop background and the LED background appear alternately according to the play frequency. The movie shooting module 33 includes a picture division unit 341, a content replacement unit 342, a graphic creation unit 343, and an automatic frame selection unit 344.
As shown in fig. 3, the picture dividing unit 341 calls the play content of the LED large screen 1 and the play frequency of the frame rate control module 31, and the picture dividing module divides the play content into a number of single-frame pictures equal to the play frequency.
As shown in fig. 3, the content replacement unit 342 divides the number of single frames by x to obtain a curtain replacement frame number, the content replacement module replaces the single frame of the playing content equal to the curtain replacement frame number with the curtain picture, the single frames of the adjacent frames of the curtain picture are all the original pictures, the content replacement module transmits the processed playing content to the LED large screen 1 for playing, and the shooting device 2 transmits the movie to the post-processing module 34 after shooting the movie.
As shown in fig. 3, the automatic frame selection unit 344 checks the LED large screen 1 playing content and selects a set frame number picture with the monotonous picture color in the playing content, and selects a start frame for inserting a screen picture according to the selected playing picture distribution.
As shown in fig. 3, the graphic creating unit 343 records the sequence of the original screen and the curtain screen in the replaced playback screen to form a frame number distribution map. After the film is shot, the post-processing module 34 corrects each frame of the film according to the frame number distribution map, and processes the curtain background and the LED background respectively according to the frame number distribution map.
As shown in fig. 2, the post-processing module 34 performs post-processing on the film whose reception is finished.
The implementation principle of the LED background and green screen shooting and synthesizing system in the embodiment of the application is as follows: can have both advantages of curtain and LED background simultaneously, bring a lot of facilities for post processing, alignment picture that can relax. The post-processing progress is accelerated, the color mixing is also helped, for example, the anti-green processing is carried out, and the correct picture color tone and the background light effect can be easily obtained through the LED background picture. And the defects of LED background shooting, such as Moire patterns, insufficient picture fineness and the like, can be solved through the traditional flow of the green screen.
The screen picture is evenly distributed in the playing picture, and the picture frame number distribution map can help a worker to check whether the automatically processed image has a problem or not, and can also help the worker to process the screen and the LED background.
The second embodiment of the present application discloses an LED background and green screen shooting composition system, as shown in fig. 4, which is different from the first embodiment in that the film shooting module 33 includes a film dividing unit 345, a film replacing unit 346, a graphic creating unit 347, and an automatic frame interpolation unit 348.
As shown in fig. 4, the film dividing unit 345 calls the film photographed by the photographing apparatus 2 and the play frame rate of the frame rate control module 31, and the film dividing unit 345 divides the film into a number of single-frame pictures equal to the play frequency.
As shown in fig. 4, the film replacing unit 346 divides the number of single frames by x to obtain a curtain replacing frame number, the film replacing unit 346 replaces the single frame equal to the curtain replacing frame number in the film with the curtain picture, the single frames of the adjacent frames of the curtain picture are all the original pictures, and the film replacing module transmits the processed playing content to the post-processing module 34.
As shown in fig. 4, the automatic frame interpolation unit 348 checks the contents of the movie and selects a set frame number picture with the monotonous picture color in the contents of the movie before replacing a single frame picture equal to the screen replacement frame number in the single frame pictures of the movie with the screen picture, and selects an initial frame for inserting the screen picture according to the distribution of the selected played picture.
As shown in fig. 4, the graphic creation unit 347 records the sequence of the screen picture and the original picture in the replaced film picture, forming a film frame number distribution map. The post-processing module 34 selects all the screen pictures in the film according to the film frame number distribution map, and processes the screen pictures after confirming that the screen pictures are normal. The post-processing module 34 processes the original pictures in the film according to the film frame number distribution map.
The implementation principle of the LED background and green screen shooting and synthesizing system in the embodiment of the application is as follows: the curtain picture evenly distributed in the film, it is littleer to the broadcast effect influence, and film frame number distribution map can help the staff to proofread whether the film after the automatic processing goes wrong, can also help the staff to handle curtain and LED background.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. A synthetic method for LED background and green screen shooting is characterized by comprising the following steps:
building an LED large screen (1);
setting a screen shooting frame rate, and adjusting the frame rate of the LED large screen (1) to be x times of the screen shooting frame rate;
controlling the shooting frame rate of the camera to be the same as the frame rate of the LED large screen (1);
shooting a film with a curtain background and an LED background alternately appearing;
and processing the shot film background.
2. The LED background and green screen shot composition method of claim 1, wherein the film in which the shot screen background and the LED background appear alternately comprises:
dividing the playing content of the LED large screen (1) according to the current frame rate of the LED large screen (1), wherein each frame of playing content is used as a single frame picture;
dividing the number of the single frame pictures of the played content by x to obtain the number of curtain replacing frames;
replacing the single-frame picture equal to the curtain replacing frame number in the single-frame pictures of the played content with the curtain picture, wherein the single-frame pictures of the adjacent frames of the curtain picture are the original pictures;
the LED large screen (1) plays the processed picture and shoots a film.
3. The LED background and green screen shot composition method of claim 1, wherein the film in which the shot screen background and the LED background appear alternately comprises:
after shooting a film, performing early-stage processing on the film, dividing the film according to the current frame rate, and taking each frame of film as a single-frame picture;
dividing the number of single-frame pictures of the film by x to obtain the number of curtain replacement frames;
and replacing the single frame picture equal to the curtain replacing frame number in the single frame pictures of the film with the curtain picture, wherein the single frame pictures of the adjacent frames of the curtain picture are the original pictures.
4. The LED background and green screen shot composition method of claim 2, wherein: calculating the number of the gap pictures which are the original pictures between the adjacent curtain pictures and are x-1;
recording the sequence of the curtain picture and the original picture in the replaced playing picture to form a picture frame number distribution map;
after the film is shot, each frame of the film is corrected according to the frame number distribution diagram of the frame, and the curtain background and the LED background are respectively processed according to the frame number distribution diagram of the frame.
5. The LED background and green screen shot composition method of claim 3, wherein: calculating the number of the gap pictures which are the original pictures between the adjacent curtain pictures and are x-1;
recording the sequence of the screen picture and the original picture in the replaced film picture to form a film frame number distribution map;
selecting all curtain pictures in the film according to the film frame number distribution map, and processing the curtain pictures after confirming that the curtain pictures are normal;
and processing the original picture in the film according to the film frame number distribution map.
6. The LED background and green screen shot composition method of claim 4, wherein: before replacing the single frame picture equal to the curtain replacing frame number in the single frame pictures of the playing contents with the curtain picture, checking the playing contents of the LED large screen (1), selecting the picture with the set frame number with the monotonous picture color in the playing contents, and selecting the initial frame inserted in the curtain picture according to the selected playing picture distribution.
7. The LED background and green screen shot composition method of claim 5, wherein: before replacing the single frame picture equal to the curtain replacing frame number in the single frame picture of the film with the curtain picture, checking the content of the film and selecting the picture with the set frame number with the monotonous picture color in the content of the film, and selecting the initial frame inserted by the curtain picture according to the distribution of the selected playing picture.
8. The utility model provides a LED background and green curtain shoot composition system which characterized in that: the LED film shooting device comprises an LED large screen (1), shooting equipment (2) and a control system (3), wherein the control system (3) comprises a frame rate control module (31), a shooting synchronization module (32), a film shooting module (33) and a post-processing module (34);
the frame rate control module (31) receives an input curtain frame rate, and the frame rate control module (31) adjusts the playing frame rate of the LED large screen (1) to be x times of the curtain frame rate;
the shooting synchronization module (32) calls the play frame rate of the frame rate control module (31) to synchronize the shooting frame rate and the play frame rate of the shooting equipment (2);
the film shooting module (33) calls the playing frequency of the shooting synchronization module (32) to shoot the film with the curtain background and the LED background alternately appearing according to the playing frequency;
and the post-processing module (34) performs post-processing on the received shot film.
9. The LED background and green screen shot composition system of claim 8, wherein: the movie shooting module (33) includes a picture dividing unit (341) and a content replacing unit (342);
the picture dividing unit (341) calls the playing content of the LED large screen (1) and the playing frequency of the frame rate control module (31), and the picture dividing module divides the playing content into single-frame pictures with the number equal to the playing frequency;
the content replacing unit (342) divides the number of the single-frame pictures by x to obtain a curtain replacing frame number, the content replacing module replaces the single-frame pictures equal to the curtain replacing frame number in the played content with the curtain pictures, the single-frame pictures of the adjacent frames of the curtain pictures are all original pictures, the content replacing module transmits the processed played content to the LED large screen (1) for playing, and the shooting equipment (2) transmits the film to the post-processing module (34) after shooting the film.
10. The LED background and green screen shot composition system of claim 8, wherein: the film shooting module (33) comprises a film dividing unit (345) and a film replacing unit (346);
the film dividing unit (345) calls the films shot by the shooting equipment (2) and the playing frame rate of the frame rate control module (31), and the film dividing unit (345) divides the films into single-frame pictures equal to the number of the playing frequencies;
the film replacing unit (346) divides the number of the single-frame pictures by x to obtain a curtain replacing frame number, the film replacing unit (346) replaces the single-frame pictures equal to the curtain replacing frame number in the film with the curtain pictures, the single-frame pictures of the adjacent frames of the curtain pictures are all original pictures, and the film replacing module transmits the processed playing content to the post-processing module (34).
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